45:07 in Greek "logos" means speech and reason, it means both. In English the word "logic" is derived from the Greek word "logos". So logic is derived from the Greek word for language since it is also the Greek word for reason, not the other way around; as in language is not derived from logic, however in Greek it is the same word. The English word "language" is derived from Latin "lingua" meaning tongue.
乖 is "well-behaved", but for most sentences in chinese that uses 乖 it would feel somewhat weird to translate it as "well-behaved", most situations "good" is a more natural translation, but it isn't wrong to translate it as "well-behaved". 52:48 we would tell children to "behave" but "be good" has similar implications.